Hall is a physical freak, and it's a huge testement to him that he's still producing the goods at his age.
I think it's a sensible signing, and marks the end of Fus's time at the club. Hall is still quality, fit and athletic and can do what we've stuggled with this season - creating momentum in the first couple of carries.
He also doesn't block the path of Roberts, McCormack etc., who probably won't be ready to be starting players next year.
In terms of his off field role, didn't he train to be an accountant? Either way, he's a smart bloke and obviously a model pro to have lasted this long at the highest level.